How to flatten a list in Python?
You can flatten a list in python using the following one-liner:
flat_list = [item for sublist in l for item in sublist]
In the example above,
l is the list of lists that is to be flattened.
The previous example can be rewritten to be more readable and will look like this:
flat_list =  for sublist in l: for item in sublist: flat_list.append(item)
You can wrap this functionality into a function if you prefer:
def flatten(l): return [item for sublist in l for item in sublist]
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